diff --git a/src/bg/ChildPolicies.js b/src/bg/ChildPolicies.js
index b6904f8..74aeccb 100644
--- a/src/bg/ChildPolicies.js
+++ b/src/bg/ChildPolicies.js
@@ -105,9 +105,10 @@
 
   var ChildPolicies = {
     addTabInfoCookie(request, info) {
+      let {tabId, frameId} = request;
       let h = {
         name: "Set-Cookie",
-        value: `${marker}=${JSON.stringify(info)}`
+        value: `${marker}_${tabId}_${frameId}=${JSON.stringify(info)}`
       };
       let {responseHeaders} = request;
       if (responseHeaders.some(({value, name}) => h.value === value && h.name === name)) {
diff --git a/src/content/staticNS.js b/src/content/staticNS.js
index c746180..6002bfd 100644
--- a/src/content/staticNS.js
+++ b/src/content/staticNS.js
@@ -52,13 +52,14 @@
       // (before any content can access it)
 
       if (this.config.MARKER = MARKER) {
-        let cookieRx = new RegExp(`(?:^|;\\s*)${MARKER}=([^;]*)`);
+        let cookieRx = new RegExp(`(?:^|;\\s*)(${MARKER}(?:_\\d+){2})=([^;]*)`);
         let match = document.cookie.match(cookieRx);
         if (match) {
+          let [cookie, cookieName, cookieValue] = match;
           // delete cookie NOW
-          document.cookie = `${MARKER}=;expires=${new Date(Date.now() - 31536000000).toGMTString()}`;
+          document.cookie = `${cookieName}=;expires=${new Date(Date.now() - 31536000000).toGMTString()}`;
           try {
-            this.config.tabInfo = JSON.parse(decodeURIComponent(match[1]));
+            this.config.tabInfo = JSON.parse(decodeURIComponent(cookieValue));
           } catch (e) {
             error(e);
           }